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Adler Planetarium getting a new 24 inch Planewave today..

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#1 Darren Drake

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Posted 28 January 2020 - 01:49 PM

The other scope was an embarrassment that was there an insanely long time.  This should be a major and much  needed step up for the place...

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#2 vtornado

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Posted 28 January 2020 - 01:58 PM

Is there good planetary viewing over lake Michigan?



#3 ShaulaB

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Posted 28 January 2020 - 02:00 PM

Congratulations!



#4 petert913

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Posted 28 January 2020 - 02:02 PM

Wonderful news !  I wish our community observatory would up grade from the crusty old 16" Newt in there.....

 

Looking forward to further reports !



#5 petert913

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Posted 28 January 2020 - 02:03 PM

BTW - how were the funds acquired, if I may ask? 

 

Maybe I can start a fund raiser for our community. 



#6 Darren Drake

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Posted 28 January 2020 - 03:53 PM

Still in a heat trap environment....

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#7 waso29

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Posted 28 January 2020 - 07:12 PM

Congrats to Adler in getting a nice donation.  

I can't wait to operate the new Planewave D-K scope.

Also looking forward to new Tak 106ed to piggyback with it.

 

Hope they can work with park district to use smarter street lighting around the museum campus.


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#8 buckeyestargazer

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Posted 29 January 2020 - 08:38 AM

Recognize anyone in this news story about the new Planewave at Adler?



#9 waso29

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Posted 29 January 2020 - 10:15 AM

adler's director of public observing, michelle nichols, and astronomy educator, adriana diaz.


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#10 jwheel

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Posted 29 January 2020 - 10:19 AM

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#11 Darren Drake

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Posted 29 January 2020 - 01:58 PM

This scope has a 48% obstruction.   Does anyone here have first hand experience looking through a scope like this with such a big obstruction?  While this scope is optimized for imaging I suspect a large % of time will be for public outreach.   Can this scope give wonderfull views of the moon and planets or is it best to use a 7 inch off axis aperture stop?  Thanks 


Edited by Darren Drake, 29 January 2020 - 01:58 PM.


#12 dustyc

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Posted 29 January 2020 - 02:26 PM

'Bout time they swapped that scope out. 

I hope the public doesn't get the idea that by looking thru that new scope the views will be like those astro photos in the video. frown.gif

Great addition to the facility.

 


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#13 siriusandthepup

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Posted 29 January 2020 - 03:23 PM

 

This scope has a 48% obstruction.   Does anyone here have first hand experience looking through a scope like this with such a big obstruction?  While this scope is optimized for imaging I suspect a large % of time will be for public outreach.   Can this scope give wonderfull views of the moon and planets or is it best to use a 7 inch off axis aperture stop?  Thanks

 

have a look a their photos and decide for yourself:

 

Planewave



#14 Starman27

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Posted 29 January 2020 - 04:52 PM

Greats news for our friends at Adler. They will put it to good use.



#15 MikiSJ

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Posted 29 January 2020 - 10:10 PM

Just curious, where is the old telescope going?



#16 Procyon

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Posted 30 January 2020 - 10:48 AM

Retirement dream! Congratulations.



#17 waso29

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Posted 30 January 2020 - 05:56 PM

Just curious, where is the old telescope going?

the 20" f/8 cassegrain and DFM fork mount are in storage.

feel free to contact adler if interested.

the mirrors were recently repolished and recoated last year.

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#18 maadscientist

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Posted 31 January 2020 - 02:42 AM

This scope has a 48% obstruction.   Does anyone here have first hand experience looking through a scope like this with such a big obstruction?  While this scope is optimized for imaging I suspect a large % of time will be for public outreach.   Can this scope give wonderfull views of the moon and planets or is it best to use a 7 inch off axis aperture stop?  Thanks 

Darren,

 

I have a 16 inch RC. I think the CO is 46%.  It provides wonderful views at the eyepiece, the moon especially. Most of the visual has been done under poor seeing on clear sky clock. I have had the scope about a month and done quite a bit of imaging and visual observing already. My TMB 40mm eyepiece works great. Collimation and temperature acclimation must be managed, but you will be fine.


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#19 Darren Drake

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Posted 31 January 2020 - 04:59 AM

Are you certain the obstruction is 46%?  I had a close friend who had that scope and I  was instrumental in both the purchase and selling of the instrument.  I know the obstruction on his 16 RC was in the 36% or so range.  What is the f ratio of your RC?



#20 555aaa

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Posted 31 January 2020 - 10:11 AM

Curious as to how the old telescope was deficient.

#21 Traveler

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Posted 31 January 2020 - 10:24 AM

Never like the idea of an open tube telescope for a public observatory.



#22 Darren Drake

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Posted 31 January 2020 - 01:07 PM

The old 20 inch had massive astigmatism spherical aberration and a 50% obstruction and would never hold collimation.   In addition it had a full thickness primary with ZERO ventilation and is in a heat trap observatory.   How something like that could have been there all that time with no action is beyond me.  It was one person in charge that did nothing to fix the situation.  It was refigured last year which improved the optics considerably.  That however wasnt enough to improve the situation enough.   Now there is someone much more competent at the helm who is making the decisions including the decision to try to save it with the refigure.  That's as I understand it.  I look forward to looking through the new scope...


Edited by Darren Drake, 31 January 2020 - 01:19 PM.

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#23 jgraham

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Posted 31 January 2020 - 03:36 PM

Coolness! Sometimes old scopes find long service in museums since the public still enjoys the view and they work equally well as displays to be looked at as well as looked thru. Also, scopes with a large CO often provide an image that looks sharp because of the light being pumped into the first diffraction ring.

If it gets people excited about looking through a beautiful scope then mission accomplished!

Enjoy the new scope!

#24 waso29

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Posted 31 January 2020 - 04:55 PM

  It was one person in charge that did nothing to fix the situation.  

BeatingADeadHorse.gif



#25 radicell2

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Posted 07 February 2020 - 10:47 AM

This scope has a 48% obstruction.   Does anyone here have first hand experience looking through a scope like this with such a big obstruction?  While this scope is optimized for imaging I suspect a large % of time will be for public outreach.   Can this scope give wonderfull views of the moon and planets or is it best to use a 7 inch off axis aperture stop?  Thanks 

The 48 % is really really bad for planetary viewing.You wont something like 28 %.A cass setup would have been better for planetary views from a light pollution city location.. If the only scopes you ever looked through have such large obstruction how will you ever imagine the view might be less than ideal?

 

The Planewave scopes are ideal wide field dark site scopes.For anything near a city's light pollution you need to invest in bypass filters. Planewaves may have photos on their website but I don't see any comparisons against a well made small obstruction cass.THe 20 inch cass you had probably gave better images than the new scope.Would have been cheaper to have the 20 incher refigured - and re-painted.

 

York University in Toronto got a 40 incher Planewave and the campus sits in the most light polluted city in Canada.

 

(I've made a couple of Cass scopes- 12 and 18 inchers,so looking into the problems they have is not strange to me)

 

Ric


Edited by radicell2, 07 February 2020 - 10:51 AM.



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